1 2 /* utftpd_nak.c: send a NAK */ 3 4 /* 5 * Copyright (C) 1999 Uwe Ohse 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include "config.h" 23 #include <sys/types.h> 24 #include <sys/ioctl.h> 25 #include <sys/stat.h> 26 #include <fcntl.h> 27 28 #include <sys/socket.h> 29 #include <netinet/in.h> 30 #include "no_tftp.h" 31 /* #include <arpa/inet.h> */ 32 33 #include <syslog.h> 34 #include <errno.h> 35 #include <unistd.h> 36 #include <string.h> 37 #include "timselsysdep.h" 38 #include "utftpd.h" 39 40 int 41 utftpd_nak(int peer, int ec, const char *et, struct utftpd_ctrl *flags) 42 { 43 struct tftphdr *ehdr; 44 int length; 45 46 ehdr = flags->sendbuf.hdr; 47 ehdr->th_opcode = htons((u_short)ERROR); 48 ehdr->th_code = htons((u_short)ec); 49 length=TFTP_OFFSET; 50 if (et) { 51 size_t l=strlen(et); 52 memcpy(flags->sendbuf.buf+length,et,l+1); 53 length+=l+1; 54 } else 55 flags->sendbuf.buf[length++]=0; 56 if (send(peer, flags->sendbuf.buf, length, 0) != length) { 57 int e=errno; 58 syslog(LOG_ERR, "send() for NAK: %s",strerror(errno)); 59 errno=e; 60 return 1; 61 } 62 return 0; 63 } 64 65